Or, as like I assume in this case, the temperature control is not precise instead of numbers use some iconography. Like 0, *, **, ***, ... edit: utf-8 snowflak

Or, as like I assume in this case, the temperature control is not precise instead of numbers use some iconography. Like 0, *, **, ***, ... edit: utf-8 snowflakes don't rener... using asterisks *